Which of the following sets of numbers could be the lengths of the sides of a triangle?
a. 7.4 cm, 10.5 cm, 15.5 cm
b. 10.5 cm, 15.5 cm, 4.5 cm
c. 7.4 cm, 15.5 cm, 23 cm
d. 7.4 cm, 10.5 cm, 19.5 cm

hi,

3. 12.15, you are correct.

4.2.01, your first digit is correct,

hope this !

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.